55 lines
1.1 KiB
Bash
Executable File
55 lines
1.1 KiB
Bash
Executable File
#!/bin/sh
|
|
|
|
_printhelp ()
|
|
{
|
|
cat<<EOF
|
|
Usage: ${1##*/} [OPTIONS] [FILES]
|
|
|
|
Cut last 10 lines from stdin. If FILES are provided, cut files instead of stdin
|
|
and output to stdout.
|
|
|
|
Note: GNU 'head' has the '-n -10' option to do this. This program is only useful
|
|
for non-GNU systems.
|
|
|
|
Options:
|
|
|
|
-h: Show this help.
|
|
-i: Replace file content instead of writing to stdout.
|
|
-t: Cut head instead of the tail. Like 'tail -n +11' with GNU tail (11
|
|
because the limit line is included).
|
|
-n N: Cut N lines instead of 10.
|
|
|
|
EOF
|
|
}
|
|
|
|
OPT_TAIL=true
|
|
OPT_LINES=10
|
|
OPT_INPLACE=""
|
|
while getopts ":ihn:t" opt; do
|
|
case $opt in
|
|
i)
|
|
OPT_INPLACE="-i"
|
|
h)
|
|
_printhelp "$0"
|
|
exit 1 ;;
|
|
n)
|
|
OPT_LINES=$OPTARG ;;
|
|
t)
|
|
OPT_TAIL=false ;;
|
|
?)
|
|
_printhelp "$0"
|
|
exit 1 ;;
|
|
:)
|
|
_printhelp "$0"
|
|
exit 1 ;;
|
|
esac
|
|
done
|
|
|
|
shift $(($OPTIND - 1))
|
|
|
|
if $OPT_TAIL; then
|
|
sed $OPT_INPLACE -n -e ":begin ; 1,${OPT_LINES}!{P;N;D} ; N ; b begin" $1
|
|
else
|
|
sed $OPT_INPLACE -n -e "1,${OPT_LINES}!p" "$@"
|
|
fi
|